Christmas at Longwood Gardens (Kennett Square, Pa., in the Brandywine Valley; tel. 610/388-1000): Everyone forgets that it's cold as they slow down to gaze at the thousands of lights -- maybe millions -- that turn the gardens into pure magic. Then they go into the conservatories to see the poinsettias and Christmas decorations. "Winter wonderland" is such a cliché, but it's really true in this case.

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